BIOCHEM 3G03 Chapter Notes - Chapter 7: Reaction Inhibitor, Reaction Rate, Turnover Number

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Analyze enzymes activity by quantifying catalytic power, substrate affinity and response to inhibitors. The more catalyst (enzyme) present, the faster the reaction. As small amounts of substrates added, enzyme activity increases almost linearly but increases less dramatically as more substrate is added. At low substrate concentrations, the enzyme quickly converts all the substrate to product, more as more substrate is added the enzyme becomes saturated. All enzyme-catalyzed reactions yield a hyperbolic v vs [s] curve, shape depends on: enzyme concentrations, concentrations of inhibitors, ph temperature, etc. Revealing: whether an enzyme is likely to catalyze a particular reaction in vivo, what substances are likely to serve as physiological regulators of the enzymes activity, which enzyme inhibitors might be effective drugs. Unimolecular reaction: involves a single reactant (ex. First-order because its rate depends on the concentration of one substance. Rate constant k has units of s-1: bimolecular/second-order reaction: a + b c. K is a second order m-1: s-1.

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